An evaluation was conducted of a Chrysler Corporation passenger car equipped with twin Engelhard catalytic converters. The test car was an extensively modified 1971 Plymouth Fury equipped with a 360 CID V-8 engine and an automatic transmission. The heart of the emission control system used on the vehicle is a pair of Engelhard Catalytic Converters. These monolithic platinum converters were installed in each side of the exhaust system about as far back as the front seat. Additional modification included exhaust gas recirculation and air injection. A series of tests were run on the car to determine what the emission levels from such a system would be in different vehicles. Chassis dynamometer loadings were varied to simulate passenger car weights, with two passengers, of 3,000, 4,500 and 5,500 lbs.